WO2016172875A1

WO2016172875A1 - Information transmission method, network device and terminal device

Info

Publication number: WO2016172875A1
Application number: PCT/CN2015/077794
Authority: WO
Inventors: 行双双; 张舜卿
Original assignee: 华为技术有限公司
Priority date: 2015-04-29
Filing date: 2015-04-29
Publication date: 2016-11-03
Also published as: CN106416307A; CN106416307B

Abstract

Disclosed are an information transmission method, a network device and a terminal device. The method is applied to a communication system comprising at least one group of terminal devices, wherein the at least one group of terminal devices multiplex the same time frequency resource. The method comprises: a network device generating a sparse extended matrix, wherein the sparse extended matrix is used for indicating the mapping relationship between a time frequency resource and a data stream; according to the sparse extended matrix, performing sparse coding on the data stream subjected to channel coding; and sending the data stream subjected to sparse coding and information about the sparse extended matrix to the at least one group of terminal devices. In the embodiments of the invention, a multimedia broadcast multicast service is combined with a non-orthogonal access technique, sparse coding is performed according to a sparse extended matrix, and a receiving end can decode a data stream subjected to sparse coding according to the sparse extended matrix. Therefore, the sharing of a frequency spectrum resource in a non-orthogonal manner in a multimedia broadcast multicast service is realized, and the frequency spectrum utilization rate is improved.

Description

Method for transmitting information, network device and terminal device

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method, a network device, and a terminal device for transmitting information.

Background technique

With the rapid development of the Internet and the popularity of multi-functional user equipment, a large number of mobile data multimedia services have emerged. Compared with the same class of data services, these mobile data multimedia services have the characteristics of large data volume, long duration, and insensitive time delay. In order to effectively utilize mobile network resources, the Long Term Evolution (LTE) system adopts Multimedia Broadcast Multicast Service (MBMS) technology. The base station groups users, establishes point-to-multipoint connections with multiple users in each group, realizes resource sharing, and improves resource utilization.

In an LTE system, a multi-user shared network resource adopts an orthogonal manner, that is, a system resource unit (RE) can be allocated to at most one user (or virtual user). For 5G systems, the growth of data services far exceeds the speed of spectrum expansion. Therefore, the original orthogonal resource occupation mode consumes limited spectrum resources.

Summary of the invention

The embodiment of the invention provides a method for transmitting information, a network device and a terminal device, which can share spectrum resources in a non-orthogonal manner under the multimedia broadcast multicast service, thereby improving spectrum utilization.

In a first aspect, a method for transmitting information is provided, the method being applied to a communication system including at least one group of terminal devices, the at least one group of terminal devices multiplexing the same time-frequency resource, the method comprising: the network device generating a sparse expansion matrix And the sparse extension matrix is used to indicate a mapping relationship between the time-frequency resource and a data stream that needs to be channel-decoded by the at least one group of terminal devices; and the channel-coded data stream is sparse-coded according to the sparse expansion matrix. Sending the sparse-coded data stream to the at least one group of terminal devices and transmitting the sparse extension matrix information to the at least one group of terminal devices.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the sparse extension matrix includes group identification information that is in one-to-one correspondence with the at least one group of terminal devices, where the sparse expansion matrix is The at least one non-zero element of the row element or the column element corresponding to the data stream that the at least one group of terminal devices need to perform channel decoding is the group identification information.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the channel-encoded data stream is sparse-coded according to the sparse expansion matrix, including: Performing channel coding on the data stream to obtain a modulation symbol; mapping the modulation symbol to a multi-gamed Galois field; and performing spreading coding on the modulation symbol according to the sparse extension matrix to obtain an extended symbol; effective in the extended symbol The symbol performs constellation point mapping to obtain a corresponding codeword; the corresponding codeword is superimposed and mapped to the resource unit.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the order of the multi-gamlo gamma field is a modulation order and a non-zero element in the sparse expansion matrix The maximum value in .

In conjunction with the second or third possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the modulation symbol is extended and coded according to the sparse expansion matrix to obtain an extended symbol, including And according to the sparse expansion matrix, the modulation symbol is multiplied by a spreading sequence corresponding to the channel-coded data stream in the sparse spreading matrix to obtain the extended symbol.

With reference to the first aspect or any one of the possible implementation manners of the first to fourth possible implementations of the first aspect, in a fifth possible implementation manner of the first aspect, the information of the sparse expansion matrix The bearer is sent in the multicast control information.

With reference to the first aspect, or any one of the first to the fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, A set of terminal device updated business requirements, updated the sparse expansion matrix.

With reference to any one of the first to the sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, before the network device generates the sparse expansion matrix, The method further includes: receiving a service request sent by each of the at least one group of terminal devices; and generating the group identification information according to the service request.

With reference to the first aspect, or any one of the first to the seventh possible implementation manners of the first aspect, in the eighth possible implementation manner of the first aspect, the terminal in the at least one group Each set of terminal devices in the device includes at least one terminal device and the data received by the respective set of terminal devices by broadcast or multicast is the same.

In a second aspect, a method of transmitting information is provided, the method being applied to include at least one set of a communication system of the terminal device, the at least one group of terminal devices multiplexing the same time-frequency resource, the method comprising: receiving, by the first terminal device of the at least one group of terminal devices, a sparse expansion matrix generated by the network device and performing the pair according to the sparse expansion matrix pair The channel-coded data stream is subjected to a sparse-coded data stream, where the sparse extension matrix is used to indicate a mapping relationship between the time-frequency resource and a data stream that the at least one group of terminal devices need to perform channel decoding; according to the sparse expansion The matrix decodes the sparsely encoded data stream.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the sparse extension matrix includes group identification information corresponding to the at least one group of terminal devices, and the at least one group of terminals in the sparse expansion matrix At least one non-zero element of the row element or column element corresponding to the data stream that the device needs to perform channel decoding is the group identification information.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the performing the sparse-coded data stream according to the sparse expansion matrix includes: a sparse spreading matrix, the sparsely encoded data stream is sparsely decoded; and according to the group of identification information in the sparse extended matrix, the service requirement of the first terminal device in the data stream after the sparse decoding is performed The data stream corresponding to the data is channel decoded.

With reference to the second aspect or any one of the possible implementation manners of the first to the second possible implementations of the second aspect, in a third possible implementation manner of the second aspect, the information of the sparse expansion matrix The bearer is received in the multicast control information.

With reference to the second aspect, or any one of the first to the third possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the method further includes: updating the service requirement.

With reference to the second aspect or any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the first terminal device Before receiving the sparse extension matrix generated by the network device and performing the sparse-coded data stream on the channel-encoded data stream according to the sparse extension matrix, the method further includes: sending a service request to the network device, so that the network device is configured according to the service Request to generate the group identification information.

With reference to the second aspect, or any one of the first to the fifth possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect, the terminal in the at least one group Each set of terminal devices in the device includes at least one terminal device and the data received by the respective set of terminal devices by broadcast or multicast is the same.

In a third aspect, a network device is provided, the network device being applied to include at least one group of terminals a communication system of the device, the at least one group of terminal devices multiplexes the same time-frequency resource, the network device includes a sending unit and a processing unit, the processing unit is configured to generate a sparse spreading matrix, and perform channel coding according to the sparse spreading matrix The data stream is subjected to sparse coding, and the sparse extension matrix is used to indicate a mapping relationship between the time-frequency resource and a data stream that needs to be channel-decoded by the at least one group of terminal devices; the sending unit is configured to send the at least one The group terminal device transmits the sparse-coded data stream and transmits the sparse extension matrix information to the at least one group of terminal devices.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the sparse extension matrix generated by the processing unit includes group identification information that is in one-to-one correspondence with the at least one group of terminal devices, where the sparse expansion matrix is The at least one non-zero element of the row element or the column element corresponding to the data stream that the at least one group of terminal devices need to perform channel decoding is the group identification information.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the processing unit is configured to perform modulation on the channel-coded data stream to obtain a modulation symbol. Mapping the modulation symbol to a multi-element Galois field; performing spreading coding on the modulation symbol according to the sparse extension matrix to obtain an extended symbol; performing constellation point mapping on the effective symbol in the extended symbol to obtain a corresponding codeword; The corresponding codewords are superimposed and mapped to resource elements.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the order of the multi-poly Galois field is a modulation order and a non-zero element in the sparse expansion matrix The maximum value in .

With reference to the second or third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the processing unit is configured to: according to the sparse expansion matrix, the modulation symbol and the The spreading sequence corresponding to the channel-encoded data stream in the sparse spreading matrix is subjected to a product operation to obtain the extended symbol.

With reference to the third aspect or any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner of the third aspect, the information of the sparse expansion matrix The bearer is sent in the multicast control information.

With reference to the third aspect or any one of the first to fifth possible implementation manners of the third aspect, in a sixth possible implementation manner of the third aspect, the processing unit is further used The sparse extension matrix is updated according to the service requirements of the at least one group of terminal devices.

In conjunction with any one of the possible implementations of the first to the sixth possible implementations of the third aspect, in a seventh possible implementation of the third aspect, the method further includes a receiving unit, configured to receive the at least a service request sent by each of a group of terminal devices; wherein the processing order The element is further configured to generate the group identification information according to the service request.

With reference to the third aspect, or any one of the first to the seventh possible implementation manners of the third aspect, in the eighth possible implementation manner of the third aspect, the terminal in the at least one group Each set of terminal devices in the device includes at least one terminal device and the data received by the respective set of terminal devices by broadcast or multicast is the same.

The fourth aspect provides a terminal device, where at least one group of terminal devices to which the terminal device belongs is multiplexed with the same time-frequency resource, the terminal device includes a receiving unit and a processing unit, and the receiving unit is configured to receive sparse data generated by the network device. An extension matrix and a data stream that is sparse-coded according to the sparse extension matrix for the channel-coded data stream, the sparse extension matrix being used to indicate the time-frequency resource and the data stream that the at least one group of terminal devices need to perform channel decoding A mapping relationship between the processing unit and the sparse-coded data stream according to the sparse expansion matrix.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the sparse extension matrix received by the receiving unit includes group identification information that is in one-to-one correspondence with the at least one group of terminal devices, where the sparse expansion matrix is The at least one non-zero element of the row element or the column element corresponding to the data stream that the at least one group of terminal devices need to perform channel decoding is the group identification information.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the processing unit is configured to perform the sparse-coded data stream according to the sparse expansion matrix. Sparse decoding; performing channel decoding on the data stream corresponding to the data required by the service of the first terminal device in the sparsely decoded data stream according to the group of identification information in the sparse spreading matrix.

With reference to the fourth aspect or any one of the possible implementation manners of the first to the second possible implementations of the fourth aspect, in a third possible implementation manner of the fourth aspect, the information of the sparse expansion matrix The bearer is received in the multicast control information.

With reference to the fourth aspect, or any one of the first to the third possible implementation manners of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the processing unit is further configured to: Update business needs.

With reference to the fourth aspect, or any one of the first to the fourth possible implementation manners of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, Sending a service request to the network device, so that the network device generates the group identification information according to the service request.

Combining any of the first to fifth possible implementations of the fourth aspect or the fourth aspect In a sixth possible implementation manner of the fourth aspect, each of the terminal devices in the at least one group includes at least one terminal device, and the each group of terminal devices are received by broadcast or multicast. The data is the same.

In the embodiment of the present invention, the non-orthogonal access technology is combined in the multimedia broadcast multicast service, and the sparse coding is performed according to the sparse extension matrix, and the receiving end can decode the sparsely encoded data stream according to the sparse extension matrix. Therefore, the sharing of spectrum resources in a non-orthogonal manner in the multimedia broadcast multicast service is realized, and the spectrum utilization rate is improved.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic diagram of a communication system using the method of transmitting information of the present invention.

2 is a schematic diagram of bit mapping processing of SCMA.

FIG. 3 is a schematic flowchart of a method for transmitting information according to an embodiment of the present invention.

FIG. 4 is a schematic flowchart of a method for transmitting information according to another embodiment of the present invention.

FIG. 5 is a schematic flowchart of a method for transmitting information according to another embodiment of the present invention.

FIG. 6 is a schematic flowchart of a process of transmitting information according to an embodiment of the present invention.

FIG. 7 is a schematic flowchart of a coding process of a data stream according to an embodiment of the present invention.

Figure 8 is a schematic block diagram of a sparsely encoded extended symbol in accordance with one embodiment of the present invention.

FIG. 9 is a schematic flowchart of a decoding process of a data stream according to an embodiment of the present invention.

Figure 10 is a schematic block diagram of a network device in accordance with one embodiment of the present invention.

Figure 11 is a schematic block diagram of a terminal device in accordance with an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The terms "component", "module", "system" and the like as used in this specification are used to mean a computer phase. A combination of entities, hardware, firmware, hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside within a process and/or execution thread, and the components can be located on one computer and/or distributed between two or more computers. Moreover, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on signals having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.

The present invention describes various embodiments in connection with a terminal device. The terminal device may also be referred to as a User Equipment (UE) user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, and a wireless communication device. , user agent or user device. The access terminal may be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), and a wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, and terminal devices in future 5G networks.

Moreover, the present invention describes various embodiments in connection with a network device. The network device may be a device for communicating with the mobile device, such as a network side device, and the network side device may be a BTS in GSM (Global System of Mobile communication) or CDMA (Code Division Multiple Access). (Base Transceiver Station, base station), may be an NB (NodeB, base station) in WCDMA (Wideband Code Division Multiple Access), or may be an eNB in LTE (Long Term Evolution) or eNodeB (Evolutional Node B), or a relay station or an access point, or an in-vehicle device, a wearable device, and a network-side device in a future 5G network.

Furthermore, various aspects or features of the present invention can be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, the computer readable medium may include, but is not limited to, a magnetic storage device (for example, a hard disk, a floppy disk, or a magnetic tape), and an optical disk (for example, a CD (Compact Disk), a DVD (Digital Versatile Disk). Etc.), smart cards and flash memory devices (for example, EPROM (Erasable Programmable Read-Only Memory, Erasable programmable read-only memory), card, stick or key drive, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, without limitation, a wireless channel and various other mediums capable of storing, containing, and/or carrying instructions and/or data.

Existing research proposes the idea of non-orthogonal access, that is, multiple users can share system resources such as spectrum resources in a non-orthogonal manner on a limited spectrum resource.

At present, sparse non-orthogonal multiple access technology can be used to improve spectrum utilization. The sparse non-orthogonal multiple access technology implements the sharing of spectrum resources in a non-orthogonal manner, that is, the superposition of multiple user information on the same spectrum resource.

However, when the spectrum resources are shared by the non-orthogonal mode in the MBMS, the receiving end needs to jointly decode all the user information due to the superposition and superposition of multiple user information during decoding, and the required user information cannot be directly separated. Therefore, the base station needs to additionally notify the receiving end of the signaling information of the decoding sequence required, thereby increasing the signaling overhead.

As shown in FIG. 1, the communication system 100 includes a network side device 102, and the network side device 102 may include a plurality of antenna groups. Each antenna group may include multiple antennas, for example, one antenna group may include

antennas

104 and 106, another antenna group may include

antennas

108 and 110, and an additional group may include antennas 112 and 114. Two antennas are shown in Figure 1 for each antenna group, although more or fewer antennas may be used for each group. Network side device 102 may additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which may include various components associated with signal transmission and reception (eg, processors, modulators, multiplexers, Demodulator, demultiplexer or antenna, etc.).

The network side device 102 can communicate with a plurality of terminal devices (e.g., the terminal device 116 and the terminal device 122). However, it will be appreciated that the network side device 102 can communicate with any number of terminal devices similar to the

terminal device

116 or 122.

Terminal devices

116 and 122 may be, for example, cellular telephones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable for communicating over wireless communication system 100. device.

As shown in FIG. 1, terminal device 116 is in communication with antennas 112 and 114, wherein antennas 112 and 114 transmit information to terminal device 116 over forward link 118 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with

antennas

104 and 106, wherein

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and from reverse link 126. The terminal device 122 receives the information.

For example, in a Frequency Division Duplex (FDD) system, for example, the forward link 118 can utilize a different frequency band than that used by the reverse link 120, and the forward link 124 can utilize the reverse link. 126 different frequency bands used.

As another example, in a Time Division Duplex (TDD) system and a Full Duplex system, the forward link 118 and the reverse link 120 can use a common frequency band, a forward link 124, and a reverse link. Link 126 can use a common frequency band.

Each set of antennas and/or areas designed for communication is referred to as a sector of the network side device 102. For example, the antenna group can be designed to communicate with terminal devices in sectors of the network side device 102 coverage area. In the process in which the network side device 102 communicates with the

terminal devices

116 and 122 through the

forward links

118 and 124, respectively, the transmit antenna of the network side device 102 can utilize beamforming to improve the signal to noise ratio of the

forward links

118 and 124. . In addition, when the network side device 102 uses beamforming to transmit signals to the randomly dispersed

terminal devices

116 and 122 in the relevant coverage area, the neighboring cell is compared with the manner in which the network side device transmits a signal to all of its terminal devices through a single antenna. Mobile devices in the middle are subject to less interference.

At a given time, the network side device 102, the terminal device 116, or the terminal device 122 may be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device can encode the data for transmission. In particular, the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be included in a transport block (or multiple transport blocks) of data that may be segmented to produce multiple code blocks.

The sparse non-orthogonal multiple access technology may include Low Density Spreading (LDS) and Sparse Code Multiple Access (SCMA). Of course, those skilled in the art may not The technology is called LDS and SCMA and can also be called other technical names.

The LDS technology superimposes multiple data streams from one or more users onto N (N is an integer not less than 1) subcarriers, where each data of each data stream is extended by sparse spread spectrum to On N subcarriers.

The SCMA technology uses a codebook to transmit multiple different data streams on the same transmission resource, wherein different data streams use different codebooks, thereby improving resource utilization. The data stream can come from the same terminal device or from different terminal devices.

Combining LDS technology or SCMA technology with MBMS enables non-orthogonal sharing of spectrum resources. The process of combining MBMS with LSD or SCMA can be as follows:

1. The terminal device sends a user subscription request to the network device;

2. The network device performs a service response;

3. The network device generates a sparse extension matrix and carries the information to the terminal device in the multicast control information;

4. The network device sparsely encodes the data stream according to the sparse extension matrix and sends the sparsely encoded data stream to the terminal device;

5. The terminal device performs sparse decoding on the sparsely encoded data stream according to the sparse spreading matrix;

6. The network device notifies the decoding sequence required by the terminal device;

7. The terminal device decodes the required data stream according to the obtained decoding sequence.

It can be seen from the above-mentioned possible combination process that sharing spectrum resources in a non-orthogonal manner in MBMS can improve spectrum utilization. However, since the network device needs to notify the decoding sequence required by the terminal device, the signaling overhead is increased.

2 is a schematic diagram of bit mapping processing of SCMA. FIG. 2 is a schematic diagram showing a bit mapping process (or encoding process) of an SCMA in which four resource elements are multiplexed by six data streams, which is a bipartite graph. As shown in FIG. 2, six data streams form one packet, and four resource units form one coding unit. A resource unit can be a subcarrier, either an RE or an antenna port.

In FIG. 2, there is a line between the data stream and the resource unit indicating that at least one data combination of the data stream is transmitted through the codeword, and a non-zero modulation symbol is transmitted on the resource unit, and the data stream and the resource unit are The absence of a connection between them means that all possible data combinations of the data stream are zero coded on the resource unit after the codeword mapping. The data combination of the data streams can be understood as follows, for example, in a binary bit data stream, 00, 01, 10, 11 are all possible two-bit data combinations.

For convenience of description, the data combinations to be transmitted of the six data streams in FIG. 2 are sequentially represented by s1 to s6, and the symbols transmitted on the four resource units in FIG. 2 are sequentially represented by x1 to x4. The connection between the data stream and the resource unit indicates that the data of the data stream is expanded to transmit a modulation symbol on the resource unit, wherein the modulation symbol may be a zero modulation symbol (corresponding to a zero element), or A non-zero modulation symbol (corresponding to a non-zero element), the absence of a connection between the data stream and the resource unit indicates that the data of the data stream is expanded without transmitting modulation symbols on the resource unit.

As can be seen from FIG. 2, the data of each data stream is transmitted by two or more resource units after codeword mapping, and the symbols sent by each resource unit are from two or two. The data of more than one data stream is superimposed by the modulation symbols mapped by the respective codewords. For example, the data combination s3 of the data stream 3 may be sent with non-zero modulation symbols on the resource unit 1 and the resource unit 2 after the codeword mapping, and the data x3 sent by the resource unit 3 is the data stream 2, the data stream 4 and The superposition of non-zero modulation symbols obtained by mapping the data combinations s2, s4 and s6 of the data stream 6 to the respective codewords. Since the number of data streams can be greater than the number of resource units, the SCMA system can effectively increase network capacity, including the number of accessible users and spectrum efficiency of the system.

In combination with the above description of the codebook and FIG. 2, the codewords in the codebook typically have the following form:

Moreover, the corresponding codebook usually has the following form:

Where N is a positive integer greater than 1, and can be expressed as the number of resource units included in one coding unit, and can also be understood as the length of the codeword; Q _m is a positive integer greater than 1, indicating the number of codewords included in the codebook. It can be understood as the modulation order, of course, those skilled in the art can be called other names, for example, Q _m is 4 in 4th order modulation; q is a positive integer, and 1 ≤ q ≤ Q _m ; the codebook and the element contained in the codeword c _{n, q} is a complex number, c _{n, q} can be expressed mathematically as:

c _n,q ∈{0,α*exp(j*β)},1≤n≤N,1≤q≤Q _m

α and β can be any real number, and N and Q _m can be positive integers.

The codeword in the codebook can form a certain mapping relationship with the data, and the mapping relationship can be a direct mapping relationship. For example, the codeword in the codebook can be combined with the two-bit data of the binary data stream to form the following mapping relationship.

For example, "00" can correspond to codeword 1, ie

"01" can correspond to codeword 2, ie

"10" can correspond to codeword 3, ie

"11" can correspond to codeword 4, ie

In combination with FIG. 2 above, when there is a connection between the data stream and the resource unit, the codebook corresponding to the data stream and the codeword in the codebook should have the following characteristics: at least one codeword exists in the codebook on the corresponding resource unit. Sending a non-zero modulation symbol, for example, there is a connection between the data stream 3 and the resource unit 1, and at least one codeword corresponding to the data stream 3 satisfies c _{1, q} ≠ _{0, 1} ≤ _q ≤ Q _m ;

When there is no connection between the data stream and the resource unit, the codebook corresponding to the data stream and the codeword in the codebook should have the following characteristics: all codewords in the codebook send zero modulation symbols on the corresponding resource unit, For example, if there is no connection between the data stream 3 and the resource unit 3, then any codeword in the codebook corresponding to the data stream 3 satisfies c _{3, q} =0 _, 1 ≤ _q ≤ Q _m .

In summary, when the modulation order is 4, the codebook corresponding to the data stream 3 in FIG. 2 above may have the following forms and features:

Where c _n,q =α*exp(j*β), 1≤n≤2,1≤q≤4, α and β can be any real number, for any q, 1≤q≤4, c _1,q And c _{2,q are} not zero at the same time, and there is at least one set of q ₁ and q ₂ , 1≤q ₁ , q ₂ ≤4, so that

And

For example, if the data s3 of the data stream 3 is "10", the data combination is mapped to a codeword, that is, a 4-dimensional complex vector according to the foregoing mapping rule:

Further, in the SCMA system, the bipartite graph can also be represented by a low density extension matrix. The extension matrix can have the following form:

Wherein, r _n,m represents an element in the extension matrix, m and n are natural numbers, and 1≤n≤N, 1≤m≤M, and N rows respectively represent N resource units in one coding unit, and M columns respectively Indicates the number of data streams that are multiplexed. Although the extension matrix can be expressed in a general form, the extension matrix can have the following characteristics:

(1) The elements in the extension matrix r _n,m ∈{0,1}, 1≤n≤N,1≤m≤M, where r _n,m =1 can be expressed in the corresponding bipartite graph, m There is a connection between the data stream and the resource unit n. It can also be understood that at least one data combination of the mth data stream is mapped to a non-zero modulation symbol by a codeword; r _n,m =0 can represent corresponding The bipartite graph explains that there is no connection between the mth data stream and the resource unit n, and it can be understood that all possible data combinations of the mth data stream are mapped to zero modulation symbols by codewords;

(2) Further optionally, the number of 0 elements in the extension matrix may be no less than the number of 1 elements, thereby embodying the characteristics of sparse coding.

At the same time, the columns in the extension matrix can be referred to as extension sequences. And the extended sequence can have the following expression:

Therefore, an extension matrix can also be thought of as a matrix of a sequence of features.

In combination with the above characterization of the extension matrix, for the example given in Figure 3, the corresponding extension matrix can be expressed as:

And the codebook used in data stream 3 in Figure 2

The corresponding extended sequence can be expressed as:

Therefore, it can be considered that the relationship of the codebook corresponding extended sequence is a one-to-one relationship, that is, one codebook uniquely corresponds to one extended sequence; and the relationship of the extended sequence corresponding codebook can be a one-to-many relationship, that is, an extended sequence. Corresponds to one or more codebooks. Therefore, the feature sequence can be understood as follows: the extended sequence corresponds to the codebook, and is composed of a zero element and an element. The position of the zero element indicates that the codeword in the corresponding codebook has zero elements at the corresponding position of the zero element, and one element It means that the elements of the codeword in the corresponding codebook are not all zero or all zero at the corresponding position of the 1 element. The correspondence between the extended sequence and the codebook can be determined by the following two conditions:

(1) The codeword in the codebook has the same total number of elements as the corresponding extended sequence;

(2) For any element position whose value is 1 in the extended sequence, at least one code word can be found in the corresponding codebook, so that the element of the code word at the same position is not zero; for any one of the extended sequences The position of the element with a value of zero, the elements of all codewords in the corresponding codebook at the same position are zero.

It should also be understood that in an SCMA system, a codebook can be directly represented and stored, such as storing each codeword in the codebook or codebook above, or only elements in a codeword where the corresponding extended sequence element is one. Wait. Therefore, when applying the present invention, it is necessary to assume that both the base station and the user equipment in the SCMA system can store some or all of the following contents pre-designed:

(1) One or more SCMA extension matrices:

Wherein r _n,m ∈{0,1},1≤n≤N,1≤m≤M, M and N are integers greater than 1, where M represents the number of multiplexed data streams, and N is a positive integer greater than 1. , can be expressed as the number of resource units contained in a coding unit, and can also be understood as the length of the codeword;

(2) One or more SCMA extension sequences:

Where 1 ≤ m ≤ M;

(3) One or more SCMA codebooks:

Where Q _m ≥ 2, Q _m may be the modulation order corresponding to the codebook, and each codebook may correspond to a modulation order, wherein a positive integer with N greater than 1 may be represented as a resource included in one coding unit. The number of units can also be understood as the length of the codeword.

It should be understood that the above-mentioned SCMA system is only an example of a communication system to which the method and apparatus for transmitting information of the present invention are applied, and the present invention is not limited thereto. Others can enable the terminal device to multiplex the same time-frequency resource in the same period. Communication systems that transmit information are all within the scope of the present invention.

In order to facilitate understanding and explanation, in the following embodiments, a method of data processing according to an embodiment of the present invention will be described by taking an application in the SCMA system as an example, unless otherwise specified.

In addition, in the embodiment of the present invention, the process of the above modulation may be similar to the modulation process in the existing SCMA system. Here, in order to avoid redundancy, detailed description thereof is omitted.

FIG. 3 is a schematic flowchart of a method for transmitting information according to an embodiment of the present invention. The method 300 can be performed by a network device, which can be a Broadcast Multicast Service Centre (BM-SC). The method is applied to a communication system including at least one group of terminal devices, each group of terminal devices including at least one terminal device and at least one terminal device having the same service requirement, and at least one group of terminal devices multiplexing the same time-frequency resource. As shown in FIG. 3, the method 300 includes:

S310, the network device generates a sparse extension matrix, where the sparse extension matrix is used to indicate a mapping relationship between the time-frequency resource and the data stream that at least one group of terminal devices need to perform channel decoding.

S320. Perform sparse coding on the channel-coded data stream according to the sparse extension matrix.

S330. Send a sparse-coded data stream to at least one group of terminal devices and send information of the sparse extension matrix to at least one group of terminal devices.

In the embodiment of the present invention, the non-orthogonal access technology is combined in the multimedia broadcast multicast service, and the sparse coding is performed according to the sparse extension matrix, and the receiving end can decode the sparse-coded data stream according to the sparse extension data. Therefore, the sharing of spectrum resources in a non-orthogonal manner in the multimedia broadcast multicast service is realized, and the spectrum utilization rate is improved.

Optionally, each of the at least one group of terminal devices includes at least one terminal device and the data received by each group of terminal devices by broadcast or multicast is the same.

The service requirements of each group of the terminal devices are the same, that is, the data corresponding to the services of each group of terminal devices is the same, so for each group of terminal devices, the network device passes the broadcast group. The data sent by the broadcast is the same. For example, if a plurality of terminal devices need to subscribe to the same content, the multiple terminal devices may be terminal devices in the same group. For example, multiple terminal devices need to subscribe to sports news information or other subscription content.

Specifically, each group of terminal devices may correspond to a plurality of resource elements (REs, resource elements), and the time-frequency resource may be a time-frequency resource block (also referred to as a time-frequency resource group) composed of multiple REs, and The plurality of REs may be the same in the time domain (ie, corresponding to the same symbol) and the locations in the frequency domain are different (ie, corresponding to different subcarriers), or the multiple REs may be in the time domain. The above positions are different (i.e., corresponding to different symbols) and the positions in the frequency domain are the same (i.e., corresponding to the same subcarrier), and the present invention is not particularly limited.

The sparse extension matrix may be used to indicate a mapping relationship between a time-frequency resource and a data stream. Specifically, the sparse extension matrix may indicate a mapping relationship between the RE and the data stream. The data stream can be a data stream that at least one group of terminal devices needs to perform channel decoding.

It should be understood that the network device may allocate data corresponding to the service required by the terminal device to the data stream, and then perform channel coding on the data stream allocated with the service to obtain a channel-coded data stream. The data stream needs to perform channel decoding on the terminal device side after channel coding. After the channel-encoded data stream is sent to the terminal device, it can be understood as a data stream that the terminal device needs to perform channel decoding. The method for channel coding is not limited in the embodiment of the present invention. Optionally, as an embodiment, the channel coding may adopt Forward Error Correction (FEC) coding, for example, Turbo coding may be adopted. Correspondingly, the channel decoding at the receiving end can use corresponding Turbo decoding.

Specifically, Sparse Code Multiple Access (SCMA) is a non-orthogonal multiple access technology. Of course, those skilled in the art may not call this technology SCMA. Other technical names. The technology uploads on the same transmission resource by means of a codebook. Multiple different data streams are transmitted, and different data streams use different codebooks to improve resource utilization. The data stream can come from the same terminal device or from different terminal devices.

The codebook used by the SCMA is a set of two or more codewords, and the codewords of the same codebook may be different from each other. The codeword may be a multi-dimensional complex number vector, and the dimension thereof is two-dimensional or two-dimensional or more, and is used to represent a mapping relationship between data and two or more modulation symbols, and the mapping relationship may be a direct mapping relationship. A direct mapping relationship can be understood as a process that does not require intermediate modulation symbols. The modulation symbol includes at least one zero modulation symbol and at least one non-zero modulation symbol, and the data may be binary bit data or multiple data, and the relationship between the zero modulation symbol and the non-zero modulation symbol may be zero or less. The number of non-zero modulation symbols.

A codebook consists of two or more codewords. The codebook may represent a mapping relationship between a possible data combination of a certain length of data and a codeword in the codebook, and the mapping relationship may be a direct mapping relationship.

The SCMA technology realizes the extended transmission of data on multiple resource units by directly mapping the data in the data stream to a code word in the codebook according to a certain mapping relationship, that is, a multi-dimensional complex vector. The data here may be binary bit data or multi-dimensional data, and multiple resource units may be resource elements in a time domain, a frequency domain, an air domain, a time-frequency domain, a spatio-temporal domain, and a time-frequency spatial domain.

The extended sequence in the text corresponds to the codebook, and consists of a zero element and an element. The zero element indicates that the codeword in the corresponding codebook has zero elements at the corresponding position of the zero element, and one element represents the corresponding codebook. The elements of the codeword at the corresponding position of the 1 element are not all zero or all zero. Two or more feature sequences form a feature matrix. It should be understood that SCMA is just a name, and the industry can use other names to represent the technology.

The codeword used by the SCMA may have a certain sparsity. For example, the number of zero elements in the codeword may be no less than the number of modulation symbols, so that the receiving end can utilize the multi-user detection technique to perform lower complexity decoding. Here, the relationship between the number of zero elements listed above and the modulation symbol is only an exemplary description of sparsity, and the present invention is not limited thereto, and the ratio of the number of zero elements to the number of non-zero elements can be arbitrarily set as needed.

An example of the communication system 100 is the SCMA system, in which a plurality of users multiplex the same time-frequency resource block for data transmission. Each resource block is composed of a number of resource REs, where the REs may be subcarrier-symbol units in OFDM technology, or may be resource units in the time domain or frequency domain of other air interface technologies. For example, in an SCMA system including L terminal devices, the available resources are divided into orthogonal time-frequency resource blocks, each resource block containing U REs, wherein the U REs may be in the same position in the time domain. . When the terminal device #L transmits data, the data to be transmitted is first divided into data blocks of S-bit size, and each data block is mapped into a group including U by searching a codebook (determined by the network device and sent to the terminal device). a modulation symbol sequence of modulation symbols X#L={X#L ₁ , X#L ₂ , . . . , X#L _U }, each modulation symbol in the sequence corresponds to one RE in the resource block, and then generates a signal waveform according to the modulation symbol . For S-bit size data blocks, each codebook contains 2S different modulation symbol groups, corresponding to 2S possible data blocks.

The above codebook may also be referred to as an SCMA codebook which is a SCMA codeword set, and the SCMA codeword is a mapping relationship of information bits to modulation symbols. That is, the SCMA codebook is a set of the above mapping relationships.

In addition, in the SCMA, at least one symbol of the group modulation symbol X#k={X#k ₁ , X#k ₂ , . . . , X#k _L } corresponding to each terminal device is a zero symbol, and at least A symbol is a non-zero symbol.

The network device may generate a sparse extension matrix according to a mapping relationship between the resource unit RE and the data stream, where the mapping relationship between the RE and the data stream is known in advance by the network device.

The service requirements corresponding to each group of terminal devices in at least one group of terminal devices are the same, that is, the data corresponding to the services of each group of terminal devices is the same. The network device can allocate data corresponding to the respective service requirements of each group of terminal devices to the corresponding data stream. The process of sparsely encoding the data stream after the service allocation may be based on LDS technology or based on SCMA technology.

It should be understood that decoding the sparsely encoded data stream according to the sparse spreading matrix may include two steps. First, the terminal device can perform sparse decoding on the sparsely encoded data stream according to the sparse spreading matrix. The process of the sparse decoding can be understood as a data stream separation process. Secondly, the data stream after the sparsely decoded data stream is decoded.

Thus, each terminal device needs to retransmit the decoding sequence when the network device only needs data transmitted by some of the data streams in all the data streams. The terminal device performs data decoding on the data streams required in all data streams according to the decoding sequence to obtain data required by the service.

One method of encoding according to a sparse spreading matrix may be referred to as sparse decoding. The method of sparse decoding may use a Message Passing Algorithm (MPA), and the channel coding may use Forward Error Correction (FEC) coding. For example, Turbo coding may be used. Therefore, correspondingly, the channel decoding of the receiving end can adopt the corresponding Turbo decoding. It should be understood that the method for channel coding is not limited in the embodiment of the present invention.

The elements in the sparse expansion matrix can be 1 or 0. When the element is non-zero, it can indicate that there is no data transmission between the data stream corresponding to the element and the resource unit. When the element is 1, it can be table Data is transmitted between the data stream corresponding to the element and the resource unit.

However, in the manner of such a multimedia broadcast multicast service combined with non-orthogonal sparse coding, the terminal device needs to perform channel decoding on all data streams. Therefore, the network device needs to notify the terminal device again that the decoding sequence corresponding to the data stream in which the data required by the terminal device is located increases signaling overhead.

Optionally, as another embodiment, the sparse extension matrix includes group identification information corresponding to at least one group of terminal devices, and row elements corresponding to the data streams of at least one group of terminal devices that need to perform channel decoding in the sparse extension matrix. At least one non-zero element in the /column element is group identification information.

It should be understood that the row elements of the sparse extension matrix can be used to represent time-frequency resources, such as resource elements, and column elements can be used to indicate data streams. The row elements of the sparse extension matrix can also be used to indicate data streams, and column elements can be used to indicate time-frequency resources.

In the embodiment of the present invention, the group identification information is used to identify multiple groups of terminal devices with different service requirements, and each group of terminal devices corresponds to one identification information. And generating a sparse expansion matrix according to the identification information of the multiple sets of terminal devices to indicate time-frequency resources and data flows corresponding to each group of terminal devices. In this way, the terminal device can decode the required data stream according to the identification information in the sparse extension matrix, and prevent the network device from separately notifying which data streams correspond to the service requirements of the terminal device, thereby reducing signaling overhead.

The group identification information can be multivariate data. The communication system may include a plurality of terminal devices, the plurality of terminal devices being grouped according to respective service requirements, each group may include at least one terminal device, and the service requirements of the at least one terminal device are the same. If at least one group of terminal devices is included in the communication system, at least one group identification information is generated, and one group identification information may correspond to a group of terminal devices.

For example, if the service requirements of the multiple terminal devices can be classified into three types, they can be divided into three groups of terminal devices. The three identifiers of the three sets of terminal devices may be 1, 2, and 3, respectively.

If the mapping relationship shown in FIG. 2 is taken as an example, that is, the number of downlink carrier resource units is 4, the number of transmitted data streams is 6, and three sets of terminal devices, the sparse expansion matrix generated according to the group identification information may be as follows:

The number of rows of the H _LDS is the number of downlink carrier resource units, and the number of columns corresponds to six data streams. The non-zero element in the H _LDS is group identification information that the terminal device decodes the data stream. The group identification information may correspond to the number of groups of each group of terminal devices, wherein the largest non-zero element in the H _LDS is 3.

After obtaining the sparse extension matrix including the group identification information, the terminal device can perform sparse decoding on the data stream that has been allocated according to the sparse extension matrix to obtain multiple data streams. Further, data decoding is performed on the data stream in which the group identification information corresponding to the terminal device is located, and data required by the terminal device is obtained.

For example, if the terminal device belongs to the third group (that is, the group identification information is 3), after the sparse decoding, the terminal device only uses the second data stream corresponding to the group identification information 3, the third data stream, and the fourth The data stream is decoded by data to obtain data of the three data streams.

Optionally, as another embodiment, the information bearer of the sparse extension matrix is sent in the multicast control information.

Specifically, the network device may send the information of the sparse extension matrix on the multicast control channel, that is, the information of the sparse extension matrix may be carried on the multicast control information. In the embodiment of the present invention, the manner of transmitting the information of the sparse extension matrix is not limited, and may also be sent on other channels. When transmitting the information of the sparse extended matrix on the multicast control channel, its possible standard embodiment can be as follows:

The SpreadingMatrixConfiguration indicates that the BM-SC sends the information of the sparse extended matrix to the terminal device.

FIG. 4 is a schematic flowchart of a method for transmitting information according to another embodiment of the present invention. The same steps in FIG. 4 as those in FIG. 3 may be given the same reference numerals. The method 300 can also include:

S340. Update the sparse expansion matrix according to the service requirement of at least one group of terminal equipment updates.

It should be understood that the sparse extension matrix including the group identification information is defined by the network device, and may remain unchanged during the downlink transmission process, and may also be updated. Specifically, in the multicast broadcast mode, since the multicast broadcast period is long, when the service demand of the terminal device changes, the change of the service demand is fed back to the network device. Then, the network device updates the sparse extension matrix according to the updated service requirement of the terminal device, and sends the updated sparse extension matrix to the terminal device.

It should also be understood that the update of the sparse extension matrix may be performed on all or all of the matrix, and the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, in S320, the process of sparse coding may be as follows:

Step 1. Modulating the data stream after channel coding to obtain a modulation symbol;

Step 2: mapping modulation symbols to a multi-element Galois field;

Step 3: performing spreading coding on the modulation symbols according to the sparse expansion matrix to obtain an extended symbol;

Step 4: performing constellation point mapping on the valid symbols in the extended symbol to obtain a corresponding codeword;

Step 5. Superimpose and map the corresponding codeword to the resource unit.

Specifically, the service may include a broadcast service. It should be understood that the network device may allocate service data required by the terminal device to the data stream corresponding to the service requirement of each group of terminal devices. Taking FIG. 2 as an example, the service data required by the third group of terminal devices 3 is allocated to the second data stream (S ₂ ), the third data stream (S ₃ ), and the fourth data stream (S ₄ ). .

The above method of sparse coding may belong to the encoding process of the data stream shown in FIG.

FIG. 7 is a schematic flowchart of a coding process of a data stream according to an embodiment of the present invention. The encoding process shown in FIG. 7 can be implemented by a network device, which can be a BM-SC.

Specifically, in FIG. 7, the encoding process of the data stream by the transmitting end may include: channel coding and sparse coding. This sparse coding can employ the method of sparse coding described above.

The channel coding may adopt Turbo coding, and the process of the sparse coding may include: modulation, mapping to multiple Galois fields, extended coding, constellation point mapping, and resource element mapping.

Specifically, the modulation process in FIG. 7 may correspond to the foregoing step 1. The mapping to the multi-gamlo Vegas domain may correspond to the foregoing step 2. The extension coding may correspond to the foregoing step 3. The constellation point mapping may correspond to the foregoing step 4, and the resource unit mapping may be Corresponding to step 5 above.

Figure 7 shows only the processing of three data streams. It should be understood that, when performing resource unit mapping, codewords of multiple data streams are superimposed and mapped onto the resource unit RE.

Optionally, as another embodiment, the order of the multi-gamlo Vegas domain may be a maximum of the modulation order and the non-zero elements in the sparse extension matrix.

Specifically, the order of the GF(q) domain may take the maximum of the modulation order and the non-zero element in the sparse extension matrix, ie, q=max(m,n), where m is the modulation order and n is sparse The maximum value of a non-zero element in the expansion matrix.

Optionally, as another embodiment, the modulation symbol is extended and coded according to the sparse extension matrix to obtain an extended symbol, which may include:

According to the sparse spreading matrix, the modulation symbol is multiplied by the spreading sequence corresponding to the channel-coded data stream in the sparse spreading matrix to obtain an extended symbol.

Specifically, each data stream is assigned a corresponding spreading sequence. The modulation symbol is multiplied by a non-zero element in the extended sequence, and the operation is defined in the GF(q) field, and an extended symbol can be obtained.

For example, taking the above H _LDS as an example,

The extension sequence corresponding to the first data stream is h ₁ =[0 h ₁₁ 0 h ₁₂ ] ^T , and the extension sequence corresponding to the second data stream is h ₁ =[h ₂₁ 0 h ₂₂ 0] ^T .

After the data stream after the service allocation is sparse-coded, the data stream can be occupied by the resource unit as shown in FIG. 8.

As shown in FIG. 8, the extended symbols of the first data stream (S ₁ ) correspond to the second resource unit (x ₂ ) and the fourth resource unit (x ₄ ), respectively; the second data stream (S ₂ ) The extended symbols respectively correspond to the first resource unit (x ₁ ) and the third resource unit (x ₃ ); the extended symbols of the third data stream (S ₃ ) respectively correspond to the first resource unit (x ₁ ) and the second Resource elements (x ₂ ); the extended symbols of the fourth data stream (S ₄ ) correspond to the third resource unit (x ₃ ) and the fourth resource unit (x ₄ ), respectively; the fifth data stream (S ₅ The extension symbols correspond to the first resource unit (x ₁ ) and the fourth resource unit (x ₄ ), respectively; the extension symbols of the sixth data stream (S ₆ ) correspond to the second resource unit (x ₂ ) and The third resource unit (x ₃ ).

The above-mentioned sparse coding process may adopt an LDS-like scheme or an SCMA-like scheme. The schemes based on the LDS-like scheme and the SCMA-like scheme are respectively described in detail below.

Taking the first data stream in FIG. 2 as an example, the process of sparse coding of a network device based on an LDS-like scheme can be as follows:

Step 1, the modulation order is m=4, the modulation symbol modulated by the first data stream is a, and a contains two bits of information;

Step 2. Map the modulation symbol a to the GF(q) domain to obtain a _Q , where q=max(m,n);

Step 3. Perform extended coding on the first data stream according to the sparse expansion matrix.

Specifically, the extended sequence corresponding to the first data stream is h ₁ =[0 h ₁₁ 0 h ₁₂ ] ^T , and the extended symbol obtained by the modulation symbol a is s ₁ =[0 s ₁₁ 0 s ₁₂ ] ^T ,s ₁ = a _Q (*)h ₁ , where (*) indicates that the operation is defined in the multivariate GF(q) domain.

Step 4: performing constellation point mapping on the extended symbol s ₁ =[0 s ₁₁ 0 s ₁₂ ] ^T ;

Specifically, the mapping here only performs constellation point mapping on s ₁₁ , s ₁₂ to generate a codeword. At this time, the order of the constellation points is q, and the number of generated constellation point patterns is N _q =q ² , that is, the number of code words. In order to avoid collision of codewords between different data streams, the codewords obtained by each data stream need to undergo phase rotation. Assume that the phase rotation factor of the first data stream (S ₁ ) is

The codeword after phase rotation is x ₁ =[0 x ₁₁ 0 x ₁₂ ] ^T , where x _1j = s _1j · r ₁ . N _data represents a constant that distinguishes the phase rotation factor, and can be defined according to the number of data streams. The value of i ranges from 0 to N _data .

Step 5: All the data streams are superimposed and mapped to the resource unit by the expanded codewords.

In the above description, the data stream is extended coded and then adopts the LDS scheme, that is, the non-fixed codebook scheme. Optionally, as another embodiment, the embodiment of the present invention may adopt an SCMA scheme. The network device (BM-SC) can allocate a fixed codebook for each data stream, and the codebook includes codewords required for constellation point mapping, and the codebooks of all data streams constitute a codebook set.

Specifically, taking the first data stream as an example, the codebook allocated by the BM-SC for the first data stream may be:

Where x _1,j =[0 x ₁₁ 0 x ₁₂ ] ^T , j=1,...,N _q , then the process of BM-SC based on SCMA scheme for sparse coding can be as follows:

The codeword after constellation point mapping is x _1,j =[0 x ₁₁ 0 x ₁₂ ] ^T , wherein the codeword sequence number can be calculated according to the extended symbol: j=s ₁₁ ·q+s ₁₂ , and then according to the codeword sequence number Find x _1,j in codebook X ₁ .

Optionally, as another embodiment, before S310, the method 300 may further include:

S350. Receive a service request sent by each terminal device of at least one group of terminal devices.

S360: Generate group identification information according to the service request.

The network device in the embodiment of the present invention may generate at least one group identification information according to the service request of each terminal device, and the service requirements of the terminal devices corresponding to each group identification information are the same.

It should be understood that the network device can also respond to the service request of the terminal device.

As can be seen from the sparse expansion matrix described above, the number of non-zero elements per column is 2, and the number of non-zero elements per line is 3. That is to say, the above-described sparse expansion matrix has a column weight d _v = 2 and a row weight d _f = 3. Optionally, as another embodiment, the column weight and the row weight of the sparse expansion matrix in the embodiment of the present invention may be non-constant, that is, the values of d _v and d _f are not fixed.

Specifically, the row weight and the column weight of the sparse expansion matrix are constant. Taking the first data stream as an example, the process of sparse coding of a network device (BM-SC) based on an LDS-like scheme can be as follows:

Specifically, the spreading sequence corresponding to the first group of data streams is h ₁ =[0 h ₁₁ h ₁₂ h ₁₃ ] ^T , and the spreading symbol obtained by the expansion of the modulation symbol a is s ₁ =[0 s ₁₁ s ₁₂ s ₁₃ ] ^T , s ₁ = a _Q (*) h ₁ , where (*) indicates that the operation is defined in the multivariate GF(q) domain.

Specifically, the mapping here only performs constellation point mapping on s ₁₁ , s ₁₂ , s ₁₃ to generate a codeword. At this time, the order of the constellation points is q, and the number of generated constellation point patterns is N _q =q ³ , that is, the number of code words. In order to avoid collision of codewords between different data streams, the codewords obtained by each data stream are subjected to phase rotation. Assume that the phase rotation factor of the first data stream (S ₁ ) is

The codeword after phase rotation is x ₁ =[0 x ₁₁ x ₁₂ x ₁₃ ] ^T , where x _1j = s _1j · r ₁ . N _data represents a constant that distinguishes the phase rotation factor, and can be defined according to the number of data streams. The value of i ranges from 0 to N _data .

In addition, the identification information is used to identify multiple groups of terminal devices with different service requirements, and each group of terminal devices corresponds to one identification information. And generating a sparse expansion matrix according to the identification information of the multiple sets of terminal devices to indicate time-frequency resources and data flows corresponding to each group of terminal devices. In this way, the terminal device can decode the required data stream according to the identification information in the sparse extension matrix, and prevent the network device from separately notifying which data streams correspond to the service requirements of the terminal device, thereby reducing signaling overhead.

FIG. 5 is a schematic flowchart of a method for transmitting information according to another embodiment of the present invention. The method 500 is applied to a communication system including at least one terminal device, at least one group of terminal devices multiplexing the same time-frequency resource, the method 500 comprising:

S510: The first terminal device of the at least one group of terminal devices receives the sparse extension matrix generated by the network device, and the data stream that is sparse-coded according to the sparse extension matrix, and the sparse extension matrix is used to indicate the time-frequency resource. a mapping relationship between data streams that need to be channel-decoded with at least one group of terminal devices;

S520. Decode the data stream that is sparse-coded according to the sparse expansion matrix.

It should be understood that the first terminal device may be any one of the at least one group of terminal devices, and only one of the terminal devices is described in the embodiment of the present invention.

Optionally, as another embodiment, the sparse extension matrix may include at least the network device determines A group identification information, the at least one group of terminal devices corresponding to the at least one group identification information.

In the embodiment of the present invention, the group identification information is used to identify multiple groups of terminal devices with different service requirements, and each group of terminal devices corresponds to one identification information. And generating a sparse extension matrix according to the group identification information of the group of terminal devices to indicate a time-frequency resource corresponding to the data to be transmitted and a data stream required by each group of terminal devices in channel decoding. In this way, the terminal device can decode the required data stream according to the identification information in the sparse extension matrix, and prevent the network device from separately notifying which data streams correspond to the service requirements of the terminal device, thereby reducing signaling overhead.

The service requirements of each group of the terminal devices are the same, that is, the data corresponding to the services of each group of terminal devices is the same, so for each group of terminal devices, the network device passes the broadcast group. The data sent by the broadcast is the same. For example, if a plurality of terminal devices need to subscribe to the same content, the multiple terminal devices may be terminal devices in the same group. For example, multiple terminal devices need to subscribe to sports news information or other subscription content. The network device can allocate data corresponding to the respective service requirements of each group of terminal devices to the corresponding data stream. The process of sparsely encoding the data stream after the service allocation may be based on LDS technology or based on SCMA technology.

The group identification information may include multivariate data. The communication system may include a plurality of terminal devices, the plurality of terminal devices being grouped according to respective service requirements, each group may include at least one terminal device, and the service requirements of the at least one terminal device are the same. This business requirement can be a subscription requirement. The same business needs can be the same for the subscription. If at least one group of terminal devices is included in the communication system, at least one group identification information is generated, and one group identification information may correspond to a group of terminal devices. For example, if the service requirements of the multiple terminal devices can be classified into three types, they can be divided into three groups of terminal devices. The three identifiers of the three sets of terminal devices may be 1, 2, and 3, respectively.

Optionally, as another embodiment, in S520, decoding the sparse-coded data stream according to the sparse expansion matrix may include:

Sparse decoding the data stream after sparse coding according to the sparse expansion matrix;

And performing channel decoding on the data stream corresponding to the service requirement of the first terminal device in the sparsely decoded data stream according to the at least one group identification information in the sparse spreading matrix.

Specifically, after obtaining the sparse extension matrix including the group identification information, the terminal device can perform sparse decoding on the data stream that has been allocated according to the sparse extension matrix to obtain multiple pieces of data. flow. Further, channel decoding is performed on the data stream corresponding to the group identification information to which the terminal device belongs, and data required by the terminal device is obtained.

Alternatively, the process of sparse coding may adopt an MPA algorithm, and the method of channel coding may correspond to a method of channel coding. For example, if the channel coding is Turbo coding, the turbo coding may be used. The method for channel coding or channel decoding is not limited in the embodiment of the present invention.

Specifically, the process of decoding the data stream can be as shown in FIG.

FIG. 9 is a schematic flowchart of a decoding process of a data stream according to an embodiment of the present invention. As shown in FIG. 9, the decoding process of the data stream may include thinning decoding and channel decoding.

Specifically, in combination with the mapping relationship between the data stream and the resource unit RE shown in FIG. 2, the terminal device may first perform sparse decoding on the received data stream to obtain six data streams. Further, the terminal device may perform channel decoding on the data stream required by the terminal device according to at least one group identification information in the sparse extension matrix to obtain data of the required data stream. For example, the third group of terminal devices perform channel decoding on the corresponding second data stream, the third data stream, and the fourth data stream according to the group identification information (for example, the group identification information is 3), to obtain the second data. The data of the stream, the data of the third stream and the data of the fourth stream.

Optionally, as another embodiment, the information of the sparse extension matrix may be received in the multicast control information.

Specifically, the network device may send the sparse extension matrix on the multicast control channel, that is, the sparse extension matrix may be carried on the multicast control information. The possible standard embodiments are as described above, and are not described in detail here to avoid repetition.

Optionally, as another embodiment, the method may further include:

S530, update the business requirements.

It should also be understood that the update to the sparse extension matrix can be completely modified for the matrix, or In order to partially modify the matrix, the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, before S510, the method may further include:

S540: Send a service request to the network device, so that the network device generates group identity information according to the service request.

FIG. 6 is a schematic flowchart of a process of transmitting information according to an embodiment of the present invention. The process can include:

601. The terminal device sends a service request message to the network device.

Specifically, the service request message may subscribe to a request for a user, and the service may include a broadcast service. The network device can be a BM-SC.

602. The network device sends a service response message to the terminal device.

603. The network device generates group identification information according to the service request message, and generates a sparse expansion matrix according to the group identification information.

The communication system may include a plurality of terminal devices, the plurality of terminal devices being grouped according to respective service requirements, each group may include at least one terminal device, and the service requirements of the at least one terminal device are the same. If at least one group of terminal devices is included in the communication system, at least one piece of identification information is generated, and one piece of identification information may correspond to a group of terminal devices.

The number of rows of the H _LDS is the number of downlink carrier resource units, and the number of columns corresponds to six data streams. The non-zero elements in the H _LDS are the group identification information of each group of terminal devices. The number of group identification information may correspond to the number of groups of terminal devices in each group, wherein the largest non-zero element in the H _LDS may be 3. As an example of the H _LDS sparse expansion matrix exemplified above, the first column of non-zero elements includes two non-zero elements of h ₁₁ and h ₁₂ , and are respectively assigned the

group identifiers

2 and 1, and may of course be assigned to the

group representation

1 and 2. When the value of h ₁₂ is 1, the number of groups of terminal devices corresponding to the element may be 1. That is to say, the data of the first group of terminal devices can be sent on the first data stream, and the resource unit sent is the second resource unit. When the value of h ₁₁ is 2, the number of groups of terminal devices corresponding to the element may be 2. That is to say, the data of the second group of terminal devices can be sent on the first data stream, and the transmitted resource unit is the fourth resource unit. Therefore, it can be understood that the first data stream is a superposition of data of the first group of terminal devices and the second group of terminal devices.

604. The network device sends information of the sparse extension matrix on the multicast control information.

Specifically, the BM-SC may send the information of the sparse extension matrix to the terminal device on the multicast control channel, that is, the information of the sparse extension matrix may be carried on the multicast control information. Its possible standard manifestations can be as follows:

Among them, SpreadingMatrixConfiguration indicates that the BM-SC sends the sparse extension matrix to the terminal device.

605. The network device allocates corresponding service data to the data stream corresponding to the group identifier information of each group of terminal devices.

Specifically, the service may include a broadcast service. It should be understood that the BM-SC may allocate service data to the data stream corresponding to the identification information of each group of terminal devices. For example, the service data required by the third group of terminal devices 3 is allocated to the second data stream (S ₂ ), the third data stream (S ₃ ), and the fourth data stream (S ₄ ).

606. The network device performs channel coding on the data flow after the service is allocated.

Specifically, the channel coding may use Forward Error Correction (FEC) coding, for example, Turbo coding may be employed. Therefore, correspondingly, the channel decoding of the receiving end can adopt the corresponding Turbo decoding. It should be understood that the method for channel coding is not limited in the embodiment of the present invention.

607. The network device performs sparse coding on the channel-coded data stream.

Specifically, the process for the BM-SC to sparsely encode the data stream after the service is allocated may be as follows:

Step 1. Modulating each data stream to obtain a modulation symbol;

Step 2. Mapping the modulation symbols to the multi-element Galois GF(q) domain;

Optionally, as another embodiment, the order of the GF(q) domain may take a modulation order and a maximum value of a non-zero element in the sparse extension matrix, that is, q=max(m, n), where m is The modulation order, where n is the maximum of the non-zero elements in the sparse extended matrix.

Step 3. Perform extended coding on the data stream according to the sparse expansion matrix to obtain an extended symbol.

Specifically, each data stream is allocated by a corresponding spreading sequence. The modulation symbol is multiplied by a non-zero element in the extended sequence, and the operation is defined in the GF(q) field, and an extended symbol can be obtained.

Step 5: The codewords of different data streams are superimposed and mapped to the resource unit.

The LDS scheme or the SCMA scheme may be adopted in the foregoing process 607, and the LDS scheme and the SCMA scheme are respectively described in detail below.

Taking the first data stream as an example, the process of BM-SC based on the LDS scheme for sparse coding can be as follows:

Specifically, the mapping here only performs constellation point mapping on s ₁₁ , s ₁₂ to generate a codeword. At this time, the order of the constellation points is q, and the number of generated constellation point patterns is N _q =q ² , that is, the number of code words. In order to avoid collision of codewords between different data streams, the codewords obtained by each data stream are subjected to phase rotation. Assume that the phase rotation factor of the first data stream (S ₁ ) is

In the above description, the data stream is extended coded and then adopts the LDS scheme, that is, the non-fixed codebook scheme. Optionally, as another embodiment, the embodiment of the present invention may adopt an SCMA scheme. The BM-SC may allocate a fixed codebook for each data stream, and the codebook includes codewords required for constellation point mapping, and the codebooks of all data streams constitute a codebook set.

The codeword after constellation point mapping is x _1,j =[0 x ₁₁ 0 x ₁₂ ] ^{T ï} where the codeword sequence number can be calculated according to the extended symbol: j=s ₁₁ ·q+s ₁₂ , then according to the codeword sequence number Find x _1,j in codebook X ₁ .

It should be understood that from the sparse expansion matrix described above, the number of non-zero elements per column is two, and the number of non-zero elements per line is three. That is to say, the above-described sparse expansion matrix has a column weight d _v = 2 and a row weight d _f = 3. Optionally, as another embodiment, the column weight and the row weight of the sparse expansion matrix in the embodiment of the present invention may be non-constant, that is, the values of d _v and d _f are not fixed.

Specifically, the row weight and the column weight of the sparse expansion matrix are constant. If the modulation mode is QPSK, taking the first group of data streams as an example, the process of BM-SC based on the LDS scheme for sparse coding can be as follows:

Step 1, the modulation order is m=4, the modulation symbol modulated by the first group of data streams is a, and a contains two bits of information;

Step 3. Perform extended coding on the first group of data streams according to the sparse expansion matrix.

The codeword after phase rotation is x ₁ =[0 x ₁₁ x ₁₂ x ₁₃ ] ^T , where x _1j = s _1j · r ₁ .

608. The network device sends the sparse-coded data stream to the terminal device.

609. The terminal device performs sparse decoding on the sparsely encoded data stream.

Specifically, the terminal device can jointly decode the data stream by using an MPA algorithm.

610. The terminal device performs channel decoding on the data stream that needs to be decoded according to the group identification information in the sparse extension matrix.

Specifically, the channel decoding algorithm may be FEC decoding. For example, Turbo decoding. The method for channel decoding is not limited in the embodiment of the present invention.

611. The terminal device feeds back the updated service requirement to the network device.

612. The network device updates the sparse expansion matrix according to the updated service requirement.

It should be understood that the update process may include updating all sparse extension matrices, as well as modifying portions of the sparse extension matrices.

Figure 10 is a schematic block diagram of a network device in accordance with one embodiment of the present invention. The network device 1000 of FIG. 10 can implement the methods and processes in FIGS. 3 and 6, and to avoid repetition, it will not be described in detail herein. The network device 1000 shown in FIG. 10 may include a processing unit 1001 and a transmitting unit 1002.

Transmitting unit 1002 can include a transmitting circuit. The processor can also be referred to as a CPU. In a specific application, the network device 1000 may be embedded or may be a network device such as a wireless communication device or a network side device such as a mobile phone, and may also include a carrier that accommodates the transmitting circuit and the receiving circuit to allow the network device 1000 and the remote device. Data transmission and reception between locations. Components that implement the various functions in a particular different product may be integrated with the processing unit 1001.

The processing unit 1001 can implement or perform the steps and logical block diagrams disclosed in the method embodiments of the present invention. A general purpose processor may be a microprocessor or the processor may be any conventional processor. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.

It should be understood that, in the embodiment of the present invention, the processing unit 1001 may be a central processing unit ("CPU"), and the processing unit 1001 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processing unit 1001 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.

The processing unit 1001 may generate a sparse extension matrix, and perform sparse coding on the channel-coded data stream according to the sparse extension matrix, where the sparse extension matrix is used to indicate the time-frequency resource and the data stream that at least one group of terminal devices need to perform channel decoding. Mapping relationship between

The transmitting unit 1002 may send the sparse-coded data stream and the information of the sparse extension matrix to at least one group of terminal devices to the at least one group of terminal devices.

Optionally, as another embodiment, the sparse extension matrix generated by the processing unit 1001 may include group identification information that is in one-to-one correspondence with at least one group of terminal devices, and at least one group of terminal devices in the sparse extension matrix needs to perform channel decoding. At least one non-zero element of the row element/column element corresponding to the data stream is group identification information.

Optionally, as another embodiment, the processing unit 1001 may modulate the channel-encoded data stream to obtain a modulation symbol; map the modulation symbol to the multi-element Galois field; and perform spreading coding on the modulation symbol according to the sparse extension matrix. Obtaining an extended symbol; performing constellation point mapping on the valid symbol in the extended symbol to obtain a corresponding codeword; and superimposing and mapping the corresponding codeword to the resource unit.

Optionally, as another embodiment, the order of the multi-element Galois field is a maximum of the modulation order and the non-zero elements in the sparse expansion matrix.

Optionally, as another embodiment, the processing unit 1001 may according to a sparse expansion matrix, The modulation symbol is subjected to a product operation with a spreading sequence corresponding to the channel-encoded data stream in the sparse spreading matrix to obtain an extended symbol.

Optionally, as another embodiment, the information of the sparse extension matrix may be carried in the multicast control information.

Optionally, as another embodiment, the processing unit 1001 may further update the sparse extension matrix according to the service requirement of the at least one group of terminal device updates.

Optionally, as another embodiment, the terminal device 1000 shown in FIG. 10 may further include a receiving unit 1003, where the receiving unit 1003 receives a service request sent by each terminal device of at least one group of terminal devices; wherein, the processing unit 1001 Group identification information can also be generated according to the service request.

Optionally, as another embodiment, each group of the terminal devices in the at least one group may include at least one terminal device and the data received by each group of terminal devices through broadcast or multicast is the same.

Figure 11 is a schematic block diagram of a terminal device in accordance with an embodiment of the present invention. The terminal device 1100 of FIG. 11 can implement the methods and processes in FIG. 4 and FIG. 6. To avoid repetition, it will not be described in detail herein. The terminal device 1100 shown in FIG. 11 may include a processing unit 1101 and a receiving unit 1102.

The receiving unit 1102 can include a receiving circuit. The processor can also be referred to as a CPU. In a specific application, the terminal device 1100 may be embedded or may be a network device such as a wireless communication device or a network side device such as a mobile phone, and may further include a carrier that accommodates the transmitting circuit and the receiving circuit to allow the terminal device 1100 and the remote device. Data transmission and reception between locations. Components that implement the various functions in a particular different product may be integrated with the processing unit 1101.

The processing unit 1101 can implement or perform the steps and logical block diagrams disclosed in the method embodiments of the present invention. A general purpose processor may be a microprocessor or the processor may be any conventional processor. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.

It should be understood that, in the embodiment of the present invention, the processing unit 1101 may be a central processing unit ("CPU"), and the processing unit 1101 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processing unit 1101 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.

At least one group of terminal devices to which the terminal device belongs is multiplexed with the same time-frequency resource, and the terminal device 1100 includes a processing unit 1101 and a receiving unit 1102, where

The receiving unit 1102 may receive a sparse spreading matrix generated by the network device and a data stream that is sparse-coded according to the sparse spreading matrix, and the sparse spreading matrix is used to indicate that the time-frequency resource and the at least one group of terminal devices need to be performed. a mapping relationship between channel decoded data streams;

The processing unit 1101 may decode the sparse-coded data stream according to the sparse extension matrix.

Optionally, as another embodiment, the sparse extension matrix received by the receiving unit 1102 may include group identification information that is in one-to-one correspondence with at least one group of terminal devices, and at least one group of terminal devices in the sparse extension matrix needs to perform channel decoding. At least one non-zero element of the row element or column element corresponding to the data stream is group identification information.

Optionally, as another embodiment, the processing unit 1101 may perform sparse decoding on the sparse-coded data stream according to the sparse expansion matrix; and perform sparse-decoded data according to the group identification information in the sparse extension matrix. Data corresponding to the data of the service demand of the first terminal device in the stream The stream performs channel decoding.

Optionally, as another embodiment, the processing unit 1101 may also update the service requirement.

Optionally, as another embodiment, the terminal device shown in FIG. 11 may further include a sending unit 1103, configured to send a service request to the network device, so that the network device generates group identification information according to the service request.

The technical features of the above embodiments may be applied to each other, such as the technical features and the description in the embodiments. For the sake of brevity and clarity of the application, it can be understood that the embodiments are applicable to other embodiments, and will not be further described in other embodiments.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

Additionally, the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that in the embodiment of the present invention, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

It will be apparent to those skilled in the art that, for convenience and brevity of description, the above For a specific working process of the system, the device, and the unit, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware, firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media. As used in the present invention, a disk and a disc These include compact discs (CDs), laser discs, compact discs, digital versatile discs (DVDs), floppy discs, and Blu-ray discs, where discs are usually magnetically replicated, while discs use lasers to optically replicate data. Combinations of the above should also be included within the scope of the computer readable media.

In summary, the above description is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A method for transmitting information, characterized in that the method is applied to a communication system including at least one group of terminal devices, the at least one group of terminal devices multiplexing the same time-frequency resource, the method comprising:

The network device generates a sparse extension matrix, where the sparse extension matrix is used to indicate a mapping relationship between the time-frequency resource and a data stream that needs to be channel-decoded by the at least one group of terminal devices;

Performing sparse coding on the channel-coded data stream according to the sparse expansion matrix;

Transmitting the sparse-coded data stream to the at least one group of terminal devices and transmitting the sparse extension matrix information to the at least one group of terminal devices.
The method according to claim 1, wherein the sparse extension matrix comprises group identification information corresponding to the at least one group of terminal devices, and the sparse extension matrix is required by the at least one group of terminal devices At least one non-zero element of the row element or column element corresponding to the data stream for channel decoding is the group identification information.
The method according to claim 2, wherein the sparse coding of the channel-coded data stream according to the sparse expansion matrix comprises:

Modulating the channel-coded data stream to obtain a modulation symbol;

Mapping the modulation symbols to a multi-element Galois field;

And performing spreading coding on the modulation symbol according to the sparse expansion matrix to obtain an extended symbol;

Performing constellation point mapping on the valid symbols in the extended symbol to obtain a corresponding codeword;

The corresponding codeword is superimposed and mapped to a resource unit.
The method of claim 3 wherein the order of the multivariate Galois field is a modulation order and a maximum of the non-zero elements in the sparse extension matrix.
The method according to claim 3 or 4, wherein the spreading and encoding the modulation symbols according to the sparse expansion matrix to obtain an extended symbol comprises:

And according to the sparse expansion matrix, the modulation symbol is multiplied by a spreading sequence corresponding to the channel-coded data stream in the sparse spreading matrix to obtain the extended symbol.
The method according to any one of claims 1 to 5, characterized in that the information bearer of the sparse extension matrix is transmitted in multicast control information.
The method of any of claims 1-6, further comprising:

Updating the sparse expansion matrix according to the service requirements of the at least one group of terminal devices.
Method according to any of the claims 2-7, characterized in that in the network Before the device generates a sparse expansion matrix, it also includes:

Receiving a service request sent by each of the at least one group of terminal devices;

And generating the group identification information according to the service request.
The method according to any one of claims 1-8, wherein each of the at least one group of terminal devices comprises at least one terminal device and the each group of terminal devices broadcast or multicast The received data is the same.
A method for transmitting information, characterized in that the method is applied to a communication system including at least one group of terminal devices, the at least one group of terminal devices multiplexing the same time-frequency resource, the method comprising:

The first terminal device of the at least one group of terminal devices receives a sparse extension matrix generated by the network device and a data stream that is sparse-coded according to the sparse extension matrix for the channel-coded data stream, where the sparse extension matrix is used And indicating a mapping relationship between the time-frequency resource and a data stream that is required to perform channel decoding by the at least one group of terminal devices;

And performing the sparse-coded data stream according to the sparse expansion matrix.
The method according to claim 10, wherein the sparse extension matrix comprises group identification information corresponding to the at least one group of terminal devices, and the sparse extension matrix is required by the at least one group of terminal devices At least one non-zero element of the row element or column element corresponding to the data stream for channel decoding is the group identification information.
The method according to claim 11, wherein the decoding the sparse-coded data stream according to the sparse expansion matrix comprises:

Performing sparse decoding on the sparse-coded data stream according to the sparse expansion matrix;

And performing channel decoding on the data stream corresponding to the data required by the service of the first terminal device in the sparsely decoded data stream according to the group identifier information in the sparse spreading matrix.
The method according to any one of claims 10 to 12, characterized in that the information bearer of the sparse extension matrix is received in the multicast control information.
The method of any of claims 10-13, further comprising:

Update business needs.
The method according to any one of claims 10 to 14, wherein the first terminal device receives a sparse extension matrix generated by a network device and performs channel coding on the data stream according to the sparse extension matrix. Before the sparsely encoded data stream, it also includes:

Sending a service request to the network device, so that the network device is configured according to the service request Generating the group identification information.
The method according to any one of claims 10-15, wherein each of the at least one group of terminal devices comprises at least one terminal device and the each group of terminal devices broadcast or multicast The received data is the same.
A network device, wherein the network device is applied to a communication system including at least one group of terminal devices, the at least one group of terminal devices multiplexing the same time-frequency resource, the network device comprising a sending unit and a processing unit,

The processing unit is configured to generate a sparse extension matrix, and perform sparse coding on the channel-coded data stream according to the sparse extension matrix, where the sparse extension matrix is used to indicate the time-frequency resource and the at least one The mapping relationship between the data streams that the group terminal device needs to perform channel decoding;

The sending unit is configured to send the sparse-coded data stream to the at least one group of terminal devices and send the sparse extension matrix information to the at least one group of terminal devices.
The network device according to claim 17, wherein the sparse extension matrix generated by the processing unit comprises group identification information corresponding to the at least one group of terminal devices, and the sparse expansion matrix The at least one non-zero element of the row element or the column element corresponding to the data stream that the at least one group of terminal devices need to perform channel decoding is the group identification information.
The network device according to claim 18, wherein the processing unit is specifically configured to:

Modulating the channel-coded data stream to obtain a modulation symbol;

Mapping the modulation symbols to a multi-element Galois field;

And performing spreading coding on the modulation symbol according to the sparse expansion matrix to obtain an extended symbol;

Performing constellation point mapping on the valid symbols in the extended symbol to obtain a corresponding codeword;

The corresponding codeword is superimposed and mapped to a resource unit.
The network device according to claim 19, wherein the order of the multivariate Galois field is a modulation order and a maximum of the non-zero elements in the sparse extension matrix.
The network device according to claim 19 or 20, wherein the processing unit is specifically configured to:

And according to the sparse expansion matrix, the modulation symbol is multiplied by a spreading sequence corresponding to the channel-coded data stream in the sparse spreading matrix to obtain the extended symbol.
A network device according to any one of claims 17 to 21, wherein said said The information bearing of the sparse spreading matrix is transmitted in the multicast control information.
The network device according to any one of claims 17 to 22, wherein the processing unit is further configured to update the sparse extension matrix according to a service requirement updated by the at least one group of terminal devices.
The network device according to any one of claims 18 to 23, further comprising a receiving unit, configured to receive a service request sent by each of the at least one group of terminal devices;

The processing unit is further configured to generate the group identification information according to the service request.
The network device according to any one of claims 17 to 24, wherein each of the terminal devices in the at least one group includes at least one terminal device and each of the group of terminal devices is broadcasted or The data received by the broadcast is the same.
A terminal device, wherein at least one group of terminal devices to which the terminal device belongs multiplexes the same time-frequency resource, and the terminal device includes a receiving unit and a processing unit,

The receiving unit is configured to receive a sparse extension matrix generated by the network device, and a data stream that is sparse-coded according to the sparse extension matrix, where the sparse extension matrix is used to indicate the time-frequency a mapping relationship between the resource and the data stream that the at least one group of terminal devices needs to perform channel decoding;

The processing unit is configured to decode the sparse-coded data stream according to the sparse expansion matrix.
The terminal device according to claim 26, wherein the sparse extension matrix received by the receiving unit comprises group identification information corresponding to the at least one group of terminal devices, and the sparse expansion matrix The at least one non-zero element of the row element or the column element corresponding to the data stream that the at least one group of terminal devices need to perform channel decoding is the group identification information.
The terminal device according to claim 27, wherein the processing unit is specifically configured to:

Performing sparse decoding on the sparse-coded data stream according to the sparse expansion matrix;

And performing channel decoding on the data stream corresponding to the data required by the service of the first terminal device in the sparsely decoded data stream according to the group identifier information in the sparse spreading matrix.
The terminal device according to any one of claims 26 to 28, characterized in that the information bearer of the sparse extension matrix is received in the multicast control information.
A terminal device according to any one of claims 26 to 29, wherein said said The processing unit is also used to update business requirements.
The terminal device according to any one of claims 26 to 30, further comprising a transmitting unit, configured to send a service request to the network device, so that the network device generates the Group identification information.
The terminal device according to any one of claims 26 to 31, wherein each of the at least one group of terminal devices includes at least one terminal device and each of the group of terminal devices broadcasts or The data received by the broadcast is the same.